<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>sub-menu</title>
    <style>
        #red{
            height: 300px;
            width: 300px;
            background-color: blue;
        }
    </style>
</head>
<body>
    <div id="sub-menu">sub-menu</div>
    <script src="../render/sub-menu.js"></script>
</body>
</html>